NEOS Interfaces to CONOPT

The NEOS Server offers CONOPT for the solution of nonlinearly constrained
optimization problems in AMPL format.

CONOPT is a feasible path method based on the GRG algorithm. CONOPT is
well-suited to models with very nonlinear constraints. It is a fast method for
finding a first feasible solution that is particularly well-suited to models
with few degrees of freedom. Also, for models where many equations
can be solved one by one, CONOPT will take advantage of this property.
Similarly, CONOPT eliminates from the model intermediate variables only used to define objective function terms and moves the constraints into
the objective function.

CONOPT is developed and maintained by ARKI Consulting and Development A/S
in Bagsvaerdvej, Denmark. For more information, visit the CONOPT website.

Using the NEOS Server with CONOPT

The user must submit a model in AMPL
format to solve a nonlinear programming problem. The examples section of the AMPL website
provides examples of models in AMPL format.

The nonlinear programming problem must be specified by a model file with
the options of a data file and a commands file.
If the commands file is specified, it must contain
the AMPL solve command. The commands file must not contain
the AMPL model or data commands. The model and data files
are renamed internally by NEOS.

The commands file may include AMPL commands and option settings for SNOPT.
To specify solver options, add

option conopt_options "OPTIONS";

where OPTIONS is a list of one or more of the CONOPT options. See the
document Using CONOPT with
AMPL for a list of options.
Enter the location of the AMPL model (local file)Model File: